## Slice a 3d numpy array using a 1d lookup between indices

Slice a 3d numpy array using a 1d lookup between indices import numpy as np a = np.arange(12).reshape(2, 3, 2) b = np.array([2, 0]) b maps i to j where i and j are the first 2 indexes of a, so ​a[i,j,…

## Access specified columns from .mat file in python

I have a total of 61225 matrices each having the same variable names with different data. I am interested only in the file having variable name Pose_Para this is a 1×7 file out of which I am only …

## Why Numpy and Scipy QR decomposition give me different values?

I have the following vector. x = np.array([[ 0.87695113], [ 0.3284933 ], [-0.35078323]]) When I call numpy version of qr from numpy.linalg import qr as qr_numpy qr_numpy(x)…

## Minimize a function by multiple variables and boundaries using scipy.optimize

I want to optimize this function: def cost_func(adg_guess,wave_guess,wave_opt,C0,C1,S): ka=0 for wave in wave_guesse: ka=ka+(adg_guess[find(wave,wave_guess)]-C0*np.exp(-S*(wave-440))-…

## How can I speed up scipy.integrate.quad?

Consider the following code: def disFunc(x,n): y = np.power(x, n-1)*np.exp(-x) return y def disFunc2(t,n,beta): y = integrate.quad(disFunc, a = 0, b = beta*t, args = (n)) …

## Linear extrapolation in dataframes

I have a dataset with the number of households from 2009 to 2019 on a regional level. The dataset is very complete, but some of the data is missing. As an example, I have these two regions, IE01 and …

## Line integral under surface defined by meshgrid values – Python

I need to calculate the line integral between two points (x1,y1) and (x2,y2) under a surface defined by values on a meshgrid. I’m not exactly sure on the best tool/approach to use for this process …

## Plot the dendrogram of communities found by NetworkX Girvan-Newman algorithm

The Girvan-Newman algorithm for community detection in networks: detects communities by progressively removing edges from the original graph. The algorithm removes the “most valuable” edge, …

## How to compare 2D distributions?

I need to compare 2D distributions with KL Divergence. I tried using scipy.stats.entropy but that’s returning inf. How do I set up scipy.stats.entropy to work with 2 axes and return a value? I tried:…

## saving a grid of heterogenous images in Python

How can I use something like below line to save images on a grid of 4×4 of heterogenous images? Imagine that images are identified by sample[i] and i takes 16 different values. scipy.misc.imsave(str(…